Superheater.



No. 7|6,298. Patented Dec. I6, |902'.

(Application mea Mar, 11, 1902) (Nu Hlutlel.)` 2 Sheets-Sheet l.

` d. P. SNEDDGN.

SUPERHEATER.

(Apphcation filed Mar. 11, 1902 (No Model.) 2 Sheets$heet 2.

Patented Dec. I6, |902.A Y

JAMES P. SNEDDON, OF BARBERTON, OHIO, ASSIGNOR TO THE STIRLING COMPANY,OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

SUPERHEATER.

SPECIFICATION-.forming part of Letters Patent No. 716,298, datedDecember 16, 1902.

1 Application filed March i1,19o`2.` sesamo, 97,731. (No modem`perheating can be obtained and whereby the superheater can be cut outwithout liability of injuring the same.

To these ends my invention consists in locating the superheater withreference to the boiler-setting sothat the superheating-tubes projectinto the boiler-furnace behind a battlewall and providing a controllableby pass through the battle-wall, whereby the hot gases and flamescaneither be directed through ,said superheater-tubes or cut odtherefrom to any desired extent.`

In the accompanying drawings I have shown my invention applied to aboiler of the wellknown Stirling type, and in said drawings- Figure 1 isa transverse section through the boiler, showing my superheater appliedthereto. Fig. 2 is ay plan `view of the same; and Fig. 3 is a view,partly in section, showing the construction of header andsuperheatertubes.

The boiler illustrated is 4of the well-known Stirling type, theparticular boiler shown being a Stirling f0ur-drum-boiler comprising theupper steam and water drums 1,` 2, and 3, the lower mud drum 4, and thethree banks of water-tubes 5, 6, and 7, connecting the mud drum with thesteam and waterV drums K1, 2, and 3, respectively. The feedwater inlet'is connected to the drum l, and the steam-outlet 8 is shownf connectedto the middle drum 2, although it may be connected to `either of theother steam and water drums. The steam and water drums are connected bythe steam-collecting pipes 9 andthe drums 2 and 3 by thecirculating-pipes 10. The several drums, tubes, and pipes are inclosedby the usual masonry walls 11, forming a `heating-chamber 12. At thefront and near the bottom of this chamber is the grate 13, and above thesame is the ignition-arch 14. Just back of the bank of tubes 7 is thebaiile wall or plate 15, and back of the bank of tubes 6 is the battleplate or wall 16. The outlet to the chimney is at 17.

The construction so far described is the well-known four-drum Stirlingboiler, and as it forms no part of my invention a detailed descriptionthereof is unnecessary. Suffice it to say, that the feed-water enteringthe .drum 1 passes down through the bank of tubes 5 into the mud-drum4., and from this, inasmuch as the greatest heat is at the front of thefurnace chamber, it passes upward through the bank of tubes 7 to thedrum 3, the steam passing over to the drum 2 by the pipes 9 and thewater passing to the same drum through the pipes 10 and thencedescendingthrough the bank of tubes 6 to the mud-drum, in this waymaintaining the wellknown circulation of the Stirling boiler. In lieu ofthe four-drum Stirling boiler' the invention can be equally as wellapplied to a three or a tive drum Stirling boiler, or, in fact, to anywater-tube boiler having a baie wall or plate projecting into the same.

The superheater is shown at 18, and in the specific boiler illustratedthis superheater is shown as located between the baffle-wall 16 and thebank of tubes 5, in which position the superheating-tubes are shieldedfrom the hot gases and lames when desired. It will be understood,however, that the superheater may be located at any other point in theparticular boiler-furnace shown or any other boiler-furnace, providedonly that it is located behind a battle wall or plate, so that it can beprotected from the hot gases and dames when necessary or desired. Theposition of the superheater will of course be Varied according to thetype or design of the boiler to which it is adapted. The suplerheatercomprises the header or chamber 21, which is provided with alongitudinal diaphragm 22, dividing said header into two compartments orpassages 23 and 24, respectively. One of these compartments-as, forinstance, the compartment 23--is connected by a suitable IOC pipe to thesteam-outlet pipe 8, while the -other compartment-as, for instance, the

compartment 24-is connected by a suitable pipe 26 to the engine. In theparticular superheater illustrated the steam-inlet to the header isshown at one end thereof and the steam-outlet at the other end thereof.This arrangement, however, is not essential, as the inlet and outlet mayboth be at the same end of the header or be the reverse of that shown.The steam-inlet for economical purposes will be preferably connected tothe end of the header nearest the steam-outlet pipe ot' the boiler,while the outlet from the header will be from that portion of theheaderwhich can be most conveniently connected to the engine. Theinlet-pipe 25 is provided with a cut-0E valve 27, and the outlet-pipemay be provided with a similar valve. By these valves the superheatercan at any time be cut and a by-pass pipe having a suitable valve willbe provided around the superheater, so that in case the latter becomesdisabled the saturated steam can be taken directly from the boiler tothe engine.

The specific construction of this superheater is substantially that ofthe well-known Niclausse boiler and is shown in detail in Fig. 3. Thetop and bottom walls of the` header and the diaphragm or partitiontherethrough are provided with alining openings, in which are connectedthe skeleton frames or lanterns, as they are called, 34. To the lowerends of these skeleton frames are attached the upper ends of the outertubes 36, said tubes having closed bottom ends. Within the skeletonframes 34 are other skeleton frames 37, which extend from the top wallof the header to the diaphragm 22 and which have connected to theirlower ends the inner circulatingtubes 38. These tubes extend down intothe tubes 36 and have their bottom ends open and in proximity to theclosed ends of the outer tubes. The skeleton frames 34 and 37 are cutaway, so that free communication is had between the compartment 23 andthe inner tubes 38 and the compartment 24 and the outer tubes 36. In usethe steam entering the header passes from the compartment 23 through theskeleton frames 34 and 37 into the circulating-tubes 38 and through thelatter to the lower ends of the tubes, and thence passes upward throughthe annular space between the inner and outer tubes and through theopening in the skeleton frames 34 to the compartment 24, and thence tothe place of use.

This superheater is shown with its header in a horizontal position andembedded in the top wall of the furnace-chamber with thesuperheating-tubes projecting down into the furnace-chamber in the spacebehind the baffle-wall 16, and, as shown, two such headers with tubes ofdifferent lengths are placed side by side; but neither of theseparticulars is essential. The bale-wall 16 is provided at its upper endwith an opening 40 opposite the upper ends of the tubes 36 and which canbe closed by any suitable valve-such, for instance, as the hinged valve4l or a pivoted butteriiy or other valve. This opening 40, with thevalve therein, forms a controllable by-pass, whereby the heated gasescoming up from the furnace can be either directed through thesuperheater-tubes or else cut 0E therefrom to any desired extent. Inthis way a variable degree of superheating can be secured up to themaximum capacity of the superheater. To the rear of the superheatertubesis a depending battle-wall 43, which directs the heated gases so thatthey must pass down .in between said superheater-tubes for their entirelength. By locating the superheater-tubes behind the baffle-wall in thefurnace-chamber and having the controllable bypass shown any degree ofsuperheating canV be secured up to the maximum capacity of thesuperheater, and should it bedesired to throw the superheater out ofoperation, as when it is desired to use saturated steam, or in casethesuperheater should be disabled this by-pass can be entirely cut oit, sothat the heated gases will no longer have direct contact with thesuperheater-tubes, and the temperature of that part of thefurnace-chamber will not be so great as to injure these tubes. Theopening 40 is so located that the heated gases strike the tubes neartheir connection with the header and when the steam therein is at itshighest temperature, thus giving a maximum superheating.

My su perheater, as hereinbefore stated, can be applied to anywater-tube boiler havinga baflie-wall projecting into the same, and theheater will be located behind said baffle-wall, and the latter will beprovided with the controllable by pass described. The terms in front andbehind,as usedin the specification and claims, are intended to expressrelative locations only, the word front meaning toward the source ofheat and the word behind meaning away from the source of heat.

What I claim as my invention, and desire to secure by Letters Patent,is-

1. In a superheater for steam-boilers, the combination with aheating-chamber, of superheater-tubes in said chamber, steam inlet andoutlet connections to said tubes, a baftlewall in front of said tubes,and a controllable by-pass through said bathe-wall opposite the outletend of said superheater-tubes.

2. In a superheater for steam-boilers, the combination with aheating-chamber, of a header having two compartments, tubes connected tosaid header and projecting into the heating-chamber, said tubescomprising outer tubes communicating with one of the headercompartmentsand inner tubes communicating with the other header compartment,steam-inlet connections to one of said compartments and steam-outletconnections from the other of said compartments, a baffle-wall in frontof said tubes and a controllable by- IOO IIO

the water-tubes, said superheater-tubes com` prising outer tubescommunicating with one of the header-compartments and inner tubescommunicating with the other of the headercompartments, steam-inletconnections to one of said compartments, steam-outlet connections fromthe other of said compartments,

a baflie-wall in front of said tubes, amt con-` trollable by-passthrough said baffle-wall op posite the point where saidsuperheater-tubes iconnect with said header.

projecting between said banks of water-tubes,

superheater-tubes projecting into the chamber behind said baffle-wall,and a controllable by-pass through said bafe-wall opposite the 1 outletend of said superheater-tubes.

6. In a superheater for steam-boilers, the combination with aheating-chamber, a plurality of elevated steam and water drums and alower mud-drum therein, banks of watertubes connecting the elevatedsteam and water drums with the mud-drum, a bafIie-wall j between saidbanks of water-tubes, a header having two compartments,superheater-tubes connected to said header and projectinginto thechamber behind said baffle-wall, said tubes comprising outer tubescommunicating with one of the header-compartments and inner tubescommunicating with the other header-compartment, steam-inlet connectionsto one of said compartments, steam-outlet connections from the other ofsaid compartments, and a controllable ley-pass through said battle-wall.

7. In a superheater for steam-boilers, the combination with aboiler-furnace, wat-'ertubes therein, a baffle-wall projecting into saidchamber between said water-tubes, superheater-tubes projecting into saidchamber behind said baffle-wall, steam inlet and outlet connections tosaid superheating-tubes, a controllable by-pass through said baffle-wallopposite the outlet end of said superheatertubes, and a baffle-wallbehind said superheater-tubes.

8. In a superheater for steam-boilers, the combination with aheating-chamber, a plurality of elevated steam and water drums and alower mud-drum therein, banks of watertubes connecting the steam andwater drums with the mud-drum, abafie-wall projecting down into saidchamber between said banks of water-tubes, superheater-tubes projectinginto the chamber behind said baftle-walLa controllable by-pass throughsaid baffle-Wall, and a baffle-wall projecting down into the chamberbehind said superheater-tubes.

In testimony whereof I, the said JAMES P. SNEDDON, have hereunto set myhand..

JAS. P. SNEDDON.

Witnesses:

E. E. BAKER, J. CLARENCE FRANK.

